connection problem with proxy

[gokceng]

hi i'm developing a web site with flex but i have a problem. The users are using a proxy and im using http service so i think the proxy prevents flex to execute http requests. I found some flex-config.xml configurations like

http://www.bpurcell.org/blog/index.cfm?entry=1034&mode=entry

<http-service-proxy>
....
<external-proxy>
<location>66.114.194.100:80</location>
</external-proxy>
....
</http-service-proxy>

http://www.adobe.com/support/documentation/en/flex/updater1/releasenotes.html

<web-service-proxy>
...
<external-proxy>
<location>server:8080</location>
<username>username</username>
<password>pwd</password>
<nt-domain>domain</nt-domain>
</external-proxy>
...
</web-service-proxy>

I dont know whether that solves my problem. In fact it will be good to know that what is that for. Basically the problem is without proxy the website is working but using proxy it does not work.

As a result i need to know how can i enable users to use my app with their proxy enabled. Because they must use proxy and i have to configure app according to that.

Thanks in advance...